石墨烯增强防腐涂层的研究进展

Graphene-enhanced Anticorrosion Coatings:a Review

石墨烯是一种二维片层结构材料,具有优良的抗渗透性能和化学惰性,在聚合物涂层中加入石墨烯可弥补这类涂层在服役过程中内部形成微裂纹等不足,有效延长涂层的服役寿命。本文综述了石墨烯的七种制备方法,总结对比了不同制备方法的特点,并且分析了石墨烯在防腐涂层中对腐蚀介质的屏蔽阻隔、局部导电性的改变以及作为具有慢性释放功能的缓释剂的微载体等增强涂层性能的作用。在制备石墨烯增强聚合物涂层过程中,石墨烯容易发生团聚,影响涂层服役效果。本文首先分析了石墨烯团聚现象的原因,并从物理分散和化学分散两个角度,讨论了改善石墨烯分散性的几种方法,并总结了几种分散方式的优缺点,为今后制备性能更加优良的石墨烯聚合物涂层材料提供重要的参考。石墨烯作为一种新型材料逐渐在许多领域被应用,本文还描述了石墨烯复合涂层在输电塔、天然气管道、海洋船舶、航空航天等方面的应用。

Graphene is an ultrathin two-dimensional(2D)lamellar material with high permeability resistance and chemical stability.The addition of graphene to a polymer coating can effectively overcome aging-related degradation issues such as microcracking and may extend the overall service life of protective coatings.This paper reviews seven preparation methods for graphene and outlines their essential characteristics.The roles of graphene in shielding the corrodents and changing local conductivity as well as a potential micro-carrier of slow-releasing inhibitors for inhibitor-embedded coatings are examined.When preparing graphene-polymer composite coatings,graphene is often prone to agglomeration and clustering,which affects the performance of coatings.The reasons for graphene agglomeration are discussed,and several physical and chemical options for graphene dispersion that can improve the uniformity of graphene in coatings are highlighted.Moreover,the pros and cons of the dispersion methods are briefly discussed,which may serve as reference information for directing future efforts toward the improvement of graphene-polymer coatings.Furthermore,because graphene is a relatively new material,this review also includes cases graphene how it is gradually being adapted in different coating applications,such as power transmission towers,natural gas pipelines,marine ships,and aerospace systems.